Hard Metal Insert Ribs for Chisel Material Guidance
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Solution Overview
Problem
Existing hard metal inserts for point-shaft chisels on milling machines have high material costs and unsatisfactory splitting properties due to non-organic connections and inefficient material guidance during abrasive machining of asphalt or concrete surfaces.
Innovation Solution
The hard metal insert design features ribs that extend up to the brazing surface, with a height increasing towards the foot, guiding material into spaces between the ribs for efficient material removal and integrating a radially symmetrical, rotationally symmetric structure for even stress distribution and extended service life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If ribs have constant width in longitudinal direction, then material removal guidance is improved, but material expenditure increases
Solution Approach 1:
The ribs are designed with varying width along the longitudinal direction: wider at the tip for effective material guidance and division, and narrower toward the base to reduce material expenditure. This local variation optimizes both material removal guidance and material efficiency.
2Quantity of substance
If ribs extend shorter longitudinally, then material expenditure decreases, but material guidance efficiency worsens
Solution Approach 1:
The ribs extend with optimized longitudinal length, being sufficiently long at the tip region to effectively guide and divide material, while tapering toward the base. This ensures adequate material guidance where needed while minimizing overall material usage.
3Ease of manufacture
If base plate remains exposed longitudinally, then manufacturing simplicity is improved, but tool life deteriorates due to quick wear
Solution Approach 1:
The exposed base plate sections that are prone to quick wear are eliminated. Instead, the ribs extend to the very end of the insert, removing the vulnerable exposed base plate while maintaining manufacturing simplicity through the integrated rib design.
4Device complexity
If guide elements have non-robust connection, then device complexity is reduced, but reliability deteriorates due to breakage risk
Solution Approach 1:
The guide elements (ribs) are merged into a single integrated carbide insert structure rather than being separate components. This monolithic design eliminates connection points that could fail, ensuring high reliability while maintaining simplicity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design reduces material requirements, enhances material penetration, and ensures even wear and long service life by directing material effectively and distributing stress evenly during milling operations.
Implementation Method 1
During operation of the milling machine, the removed material then wears the head of the round shank tool below the carbide insert
Data Source
Figure 1a~1b
Figure 2a~2b
Figure 3a~3b
AI summary
The invention relates to a hard metal insert (1) for a round shank chisel on a rotatable roller of a milling machine, having a cylindrical body (2), a conical tip (3) on the body (2), a soldering surface (5) which is provided on a base (6) of the body (2) and is arranged transverse to a longitudinal direction (4) of the body (2), and ribs (8) which project radially from a lateral surface (7) of the body (2) and extend in the longitudinal direction (4), wherein a height (9) of the ribs (8) above the body (2) increases in the longitudinal direction (4) towards the base (6) and a radially outwards facing web surface (10) of the ribs (8) narrows steadily in the longitudinal direction (4) towards the base (6). In order to reduce the material required for the hard metal insert (1), the invention proposes that the ribs (8) extend in the longitudinal direction (4) all the way to the soldering surface (5).